Moulded EPS Core, PVC skin and then glassed in Carbon and then vacuum bagged??

Is there a 2 or 4oz cloth over the carbon also?

I use press mould to vacuum PVC to EPS core. I don't use 2-4oz fiber glass on top of carbon.
no need. I use mitsubishi japan carbon. very tight weave. I use 4 oz e-glass under PVC. S-glass is too stiff. S-glass makes de-lam after flex many time. I try this many time before.
I use vending PVC vacuum mould to to make PVC in perfect shape before go inside mould.
I use 1/8" PVC top and bottom. I don't use high density foam under fin area. I have better technique. high density block kill my flex and torsion pattern.

I although make custom SUP. 9'1" x 29" x 3"3/4 quad + channel box. this board weight is 6.4kg.
tested in Hawaiian water. if you have chance please go to Tropical blends llc to test this board!

4 oz is not just bonding EPS and PVC. there is more meaning to it. I can't tell you sorry.
what I can say is it's all about flex and torsion. EPS dose melt over 70 centigrade degree. PVC can hold more then EPS. inner and outer skin? that is why this type construction call SANDWICH. originally this type construction come from air plain flap wing and magnetize train body. very hard and light and less vibration. I been doing this construction for windsurf and surfboard for over 20 years. for custom shape and pressing boards in Japan.

hope you can make it Hawaii. so you can test it your self.